Abstract: A discovery method is provided by a terminal in a terminal-to-terminal direct communication terminal-to-terminal direct communication. The terminal broadcasts a sequence, and receives an echo sequence on the sequence from other terminal. The terminal scrambles discovery information with the sequence, and transmits the scrambled discovery information.

Abstract: A method of offloading data is provided by a UE. The UE receives data from a macro cell base station over an MC-RB while an E-RAB between the macro cell base station and a gateway is established. The UE receives a first connection reconfiguration message from the macro cell base station after the E-RAB between a small cell base station and the gateway is established, and establishes an SC-RB according to the first connection reconfiguration message. Next, the UE receives a second connection reconfiguration message from the macro cell base station after a path between the macro cell base station and the gateway is switched to a path between the small cell base station and the gateway, and data for the MC-RB are exhausted on the macro cell base station. Then, the UE releases the MC-RB and switches to the SC-RB.

Abstract: A method and apparatus for perceiving access between a terminal and a small base station is provided. A macro base station transmits a small cell addition/change request message to a small base station that a terminal enters and transmits a message for access to the terminal when receiving a response message from the small base station. Then the macro base station obtains results of access between the terminal and the small base station and determines whether the access between the terminal and the small base station is completed based on the result of access.

Abstract: A method for discovery in device-to-device communications and an apparatus for the same are disclosed. The method performed in a device-to-device server supporting device-to-device discovery between a discovery terminal and a discoverable terminal may include receiving a device-to-device discovery participation message from the discoverable terminal, requesting a gateway to measure a proximity between the discovery terminal and the discoverable terminal, receiving a proximity measurement result from the gateway, and requesting the discovery terminal and the discoverable terminal to initiate a procedure of device-to-device discovery when the proximity measurement result satisfies a predetermined threshold. Thus, the procedure of device-to-device discovery may be performed efficiently.

Abstract: A method of providing service continuity between cellular communication and device-to-device communication is disclosed. A procedure for switching between cellular communication and device-to-device communication according to an example embodiment of the present invention may include transferring, by a gateway, a D2D bearer creation request message to an MME, transferring, by the MME, the D2D bearer creation request message to a base station, mapping, by the base station, D2D bearer QoS to D2D radio bearer QoS and transmitting an RRC connection reconfiguration message to terminals, receiving, by the base station, an RRC connection reconfiguration completion message indicating creation of a D2D radio bearer from the terminals, transmitting, by the base station, a D2D bearer creation response message indicating creation of a D2D bearer to the MME, and transferring, by the MME, the D2D bearer creation response message to the gateway.

Abstract: There are provided a device-to-device communication method, a mobile device using the same, and a device-to-device communication control method. The device-to-device communication method according to the invention may include receiving device-to-device communication resource allocation information and transmission characteristics information for device-to-device communication from a base station, and performing direct communication with an opposite terminal using the transmission characteristics information for device-to-device communication and the device-to-device communication resource allocation information, in which the transmission characteristics information includes the number of redundancy versions to be transmitted within at least one consecutive transmission time interval (TTI).

Abstract: Provided are a group control method for providing a machine type communication (MTC) service, and a mobile communication system using the method. The group control method includes categorizing one or more MTC devices into one or more MTC groups, assigning MTC group identifiers to respective MTC groups, setting MTC radio network temporary identifiers (MTC RNTIs) according to the MTC group Identifiers, and using the MTC_RNTIs for addressing the MTC devices belonging to the respective MTC groups.

Abstract: Provided is a link adaptation transmission and reception method in device-to-device (D2D) communication based on cellular mobile communication. An operation method of a terminal in the link adaptation method according to the present invention includes receiving information related to a first transmission through a D2D link, performing transmission for an opposite terminal using the information related to the first transmission, and determining information related to a second transmission after the transmission based on reception from the opposite terminal. Using the link adaptation method according to the present invention, an adaptive modulation and coding scheme may be provided at the time of data transmission on a D2D link while minimizing control of a base station, thereby reducing the complexity of a cellular network due to the D2D communication.

Abstract: Provided are a direct communication method of a terminal, a method of controlling device-to-device (D2D) communication, and a terminal device. The direct communication method of a terminal includes receiving downlink control information (DCI) from an evolved node base-station (eNB), extracting D2D transmission (Tx) or reception (Rx) grant information including a D2D pairing identity (ID) given to the terminal according to each D2D pair from the DCI, and performing data transmission or reception with a counterpart terminal according to Tx or Rx conditions set according to the D2D pairing ID.

Abstract: Disclosed are user equipment and a base station in a carrier aggregation system, and a call admission method thereof. The user equipment includes a plurality of physical layers, and the base station provides multiple component carriers. When messages for connection setup are transmitted and received between the user equipment and base station, the messages include information about what component carriers are selected by the physical layers, information about what component carriers are selectable by the physical layers, and information about calculations for uplink timing alignment, and call admission control and load balancing is performed based on the information included in the messages. Accordingly, in the carrier aggregation system, quicker call admission and load balancing are achieved.

Abstract: User equipment and a base station in a carrier aggregation system, and a call admission method thereof are discussed. The user equipment includes multiple physical layers, and the base station provides multiple component carriers. When messages for connection setup are transmitted and received between the user equipment and base station, the messages may include information about what component carriers are selected for the physical layers, information about what component carriers are selectable for the physical layers, information about calculations for uplink timing alignment. Call admission control and load balancing may be performed based on the information included in the messages. Accordingly, a carrier aggregation system providing call admission and load balancing is achieved.

Abstract: Disclosed is a method for allocating and accessing downlink resources in the OFDMA communication system. In the resource allocation method, bursts having the same modulation and channel encoding level are arranged in a predetermined temporal order on a physical layer. Information on the allocated unit resources is included in a common control block and is transmitted to a subscriber station, and the subscriber station then detects a number of the allocated unit resources to thus check the range of bursts to be received by the subscriber station. Therefore, power consumption by the subscriber station is reduced and signaling overheads of the common control information and unneeded residual resources are decreased.

Abstract: The subscriber station of claim 15, wherein the uplink data includes data to be transmitted, and a header having information on the data and the subscriber, and the uplink data generator adds the subheader includDisclosed is a method and device for requesting and reporting channel quality information in a mobile communication system. An uplink radio resource for a subscriber station having data to transmit is allocated and a CQI indicator for requesting channel quality information is added to the allocation information to be transmitted to a subscriber station. The subscriber station having received the uplink radio resource allocation information generates channel quality information by measuring the radio channel quality for communication with the base station according to existence of the indicator and transmits desired uplink data having the generated channel quality information to the base station.

Abstract: A method for requesting and reporting channel quality information (CQI) in a wireless portable Internet system is disclosed. Timing of a channel quality information request by a base station is determined, existence of an automatic repeat request acknowledgment (ARQ_ACK) message of downlink data is determined on requesting the channel quality information from the subscriber station, the automatic repeat request acknowledgment message and the radio resource for the channel quality report to the subscriber station is allocated, the automatic repeat request acknowledgment message and the channel quality report information is received, and a modulating and coding level of downlink data is determined by extracting the channel quality report information form the automatic repeat request acknowledgment message.

Abstract: Provided are an inter-carrier member handover apparatus and method. In the inter-carrier member handover apparatus and method, data is transmitted or received by allocating a plurality of carriers to a single mobile terminal, a carrier aggregation, which includes a plurality of carrier members that process the allocated carriers, is managed, and a handover between the carrier members in the managed carrier aggregation is processed when the handover is required. Therefore, an intra-base station handover can be performed when a mobile terminal and a base station exchange data using a plurality of carrier frequency bands.

Abstract: A caller authentication system that may enable a called party to be provided with identification information of a caller may be provided. The caller authentication system, including: a communication system to transmit, when a call request signal is received from a calling terminal of a caller, network information and a telephone number of the calling terminal to a certificate authority server, and to request identification of the caller, the network information and the telephone number being included in the call request signal, to transmit, when identification information of the caller is received from the certificate authority server in response to the identification request, the identification information to a called terminal of a called party, and to enable the identification information to be displayed on the called terminal.

Abstract: Provided are an apparatus and method for controlling random access of a machine type communication (MTC) device in a wireless communication network providing an MTC service, and a wireless communication system providing an MTC service. The method includes inserting, at a base station, information about a random access preamble group for an MTC device and information about a random access time for an MTC device in system information (SI), and transmitting, at the base station, the SI to at least one MTC device.

Abstract: Provided are an overload control apparatus and method for a machine type communication (MTC) service. The overload control method includes, when an overload state has occurred, including an overload indicator (OI) in a MAC subheader in a random access response to be transmitted to a terminal and transmitting the random access response, before an MTC device wanting to perform a random access procedure transmits a random access preamble to the base station, searching for a random access response transmitted from the base station, when the transmitted random access response is searched for, peeking at the random access response and receiving it, and when it is determined that an OI is included in the random access response, waiting, at the MTC device, for a predetermined delay time and transmitting the random access preamble for performing the random access procedure to the base station.

Abstract: Provided is a contention based uplink transmission method. A base station may assign a contention based radio network temporary identifier (CB-RNTI) to a plurality of terminals, and terminals assigned with the same CB-RNTI may perform contention uplink transmission using the same radio resource.

Abstract: Provided is a communication method of a base station for random access resource allocation, the communication method including broadcasting system information (SI) that includes information about an extra physical random access channel (xPRACH) of a machine type communication (MTC) terminal and information about a physical random access channel (PRACH) of a general terminal, each of the xPRACH of the MTC terminal and the PRACH of the general terminal having a separated resource space, and receiving a random access attempt from the MTC terminal in response to the broadcast.